Fe-28Mn-6Si-5Cr形状记忆合金在碱性介质中的电化学行为研究

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-03-07 DOI:10.1016/j.conbuildmat.2025.140680

C. Mariño-Martínez, A. Collazo, R. Figueroa, X.R. Nóvoa, C. Pérez

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引用次数: 0

摘要

对Fe-28Mn-6Si-5Cr形状记忆钢（SMS）进行了电化学表征，并与低碳钢进行了比较。氧化膜在高碱性介质中生成，随后评估其在腐蚀性条件下的稳定性，即高氯化物含量和降低的碱度。利用循环伏安法（CV）人工增厚薄膜，根据钢的成分提供了一种新的氧化还原过程解释。采用x射线光电子能谱（XPS）和电化学阻抗谱（EIS）对膜进行表征。观察到SMS薄膜厚度约为碳钢的两倍，可能是由于其高Mn含量。相反，Mott-Schottky研究表明，两种薄膜都表现出n型半导体特性，在碳钢上生成的薄膜缺陷更大。这可能是其在氯化物存在下对pH值降低的敏感性增加的一个因素。通过扫描电镜（SEM）对腐蚀表面形貌进行了观察，发现在MnS夹杂物周围存在大量的微坑。

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Investigation of the electrochemical behaviour of Fe-28Mn-6Si-5Cr shape memory alloy in alkaline media

The electrochemical characterization of a Fe-28Mn-6Si-5Cr shape memory steel (SMS) has been conducted and the results compared with those obtained for a low carbon steel. Oxide films were generated in a highly alkaline medium and subsequently evaluated for stability under aggressive conditions, i.e. high chloride content and decreasing alkalinity. The films were artificially thickened using cyclic voltammetry (CV), providing a novel interpretation of the redox process involved, based on the composition of the steels. The film characterization was performed by X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). It was observed that the SMS film thickness was approximately twice that of carbon steel, perhaps due to its high Mn content. Conversely, the Mott-Schottky study suggested both films exhibited n-type semiconductor characteristics, with the film generated on the carbon steel being more defective. This could be a contributing factor to its increased sensitivity to pH decrease in the presence of chlorides. The morphology of the corroded surface was examined by scanning electron microscopy (SEM), which revealed the presence of abundant pits on SMS surface initiated around the MnS inclusions.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.